484 research outputs found
Ghost propagator and the Coulomb form factor from the lattice
We calculate the Coulomb ghost propagator G(|p|) and the static Coulomb
potential V_C(|r|) for SU(2) Yang-Mills theory on the lattice. In view of
possible scaling violations related to deviations from the Hamiltonian limit we
use anisotropic lattices to improve the temporal resolution. We find that the
ghost propagator is infrared enhanced with an exponent kappa_gh ~ 0.5 while the
Coulomb potential exhibits a string tension larger than the Wilson string
tension, sigma_C ~ 2 sigma. This agrees with the Coulomb "scaling" scenario
derived from the Gribov-Zwanziger confinement mechanism.Comment: 23 pages, 5 figures. Some issues clarified and extended, references
added. To appear in PR
Strange hadronic stellar matter within the Brueckner-Bethe-Goldstone theory
In the framework of the non-relativistic Brueckner-Bethe-Goldstone theory, we
derive a microscopic equation of state for asymmetric and -stable matter
containing and hyperons. We mainly study the effects of
three-body forces (TBFs) among nucleons on the hyperon formation and the
equation of state (EoS). We find that, when TBFs are included, the stellar core
is almost equally populated by nucleons and hyperons. The resulting EoS, which
turns out to be extremely soft, has been used in order to calculate the static
structure of neutron stars. We obtain a value of the maximum mass of 1.26 solar
masses (1 solar mass ). Stellar rotations
increase this value by about 12%.Comment: 4 pages, Latex, 2 figures included. To appear in the Proceedings of
'' Bologna 2000 - Structure of the Nucleus at the Dawn of the Century'', May
29- June 3, 2000, Bologna, Ital
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